Speed-controller.



No. 766,229. PATENTED AUG. 2, 1904.

E. R. DOUGLAS.

SPEED CONTROLLER.

APPLICATION FILED FEB. 24. 1903.

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/ IIZ WITNESSES: IN VE N 70/? MAME/14 4 Patented August 2, 190%.

PATENT @FFICE.

EDWIN RUST DOUGLAS, OF EAST ORANGE, NElY JERSEY, ASSIGNOR TOCROGKER-TVHEELER COMPANY, OF AMPERE, NEW JERSEY, A CORPO- RATION OF NEWVJERSEY.

SPEED-CONTROLLER.

SPECIFICATION forming part of Letters Patent No. 766,229, dated August2, 1904. Application filed February 24, 1903. Serial No. 144,669. (Nomodel.)

To ctZZ whom, it may concern.-

Be it known that I, EDWIN RUs'r DoUeLAs, a citizen of the United Statesof America, and a resident of East Orange, county of Essex, and

5 State of New J ersey,have invented certain new and useful Improvementsin Speed-Controllers, of which the following is a specification.

My invention relates. to speed-controllers for motor-driven tools whereit is desirable to regulate the speed of a revolving member according toits diameter.

There is a large variety of machines*such as emery-grinders, circularsaws, bufling-machines, and the likewhere the emery-wheels or circularsaws, as the case may be, are frequently changed or wear from a largerto a smaller diameter at the same time. To obtain the best results withsuch implements, the peripheral speed should be maintained practi- 2cally the same for all diameters for any given implement, or, what isthe same thing, the number of revolutions per minute should varyinversely as the diameter.

The object of my invention is to provide a convenient means for readilydetermining and fixing the speed of the revolving member.

My invention consists in providing a movable member-such, for instance,as a leverarnrwhich is adapted to have its movement 3 in one directionlimited by coming in contact with the periphery of the revolving memberwhose speed is to be regulated, in providing a controller for the motorwhich drives the revolving member, and in providing connections betweenthe controller-handle and the movable member whereby the movement of thecontroller-handle and consequently the speed of the driving-motor and ofthe revolving member are limited by the diameter of the re- 4 volvingmember.

In the drawing accompanying and forming part of this specification,numeral 1 represents an emery-wheel mounted on the shaft 2.

3 represents the framework of any suitable construction for the bearingsfor the shaft 2, adapted to support the emery-wheel.

5 represents the controller-lever of an electric controller 'of anysuitable construction,

and it is adapted to make contact with the lugs a, b, e, (Z, and e andadapted in these succes' sive positions from (0 to e to increase thespeed of the motor by successive steps. The rear of the controller-leveris provided with an opening 6 and sliding block 7, the sliding block 7being controlled in its position in the slot by means of the screw 8.

9 is a lever pivotally mounted on the stud 10 in any suitable support.The lever 9 is provided with a slot 11 and is connected with thecontroller-lever 5 by means of the link 12. The upper end of the link 12is provided with a bolt 13, by means of which the position of the upperend of the link is adjusted in the slot 11 and clamped in its properposition. The end of the lever 9 carries the roller 1%, which is in theplane of the wheel 1 and as the controller-lever is moved from (0 toward(3 comes in contact with the wheel 1, and thereby limits the movement ofthe COHCIOllQP-lQX QI' according to the size of the wheel 1.

15 represents in dotted lines a wheel of smaller diameter, and 16represents the roller in the position in which it would be with thewheel 15. The position of the controller-lever would then be asrepresented in dotted lines at 1'7, making contact with the lug (Z andgiving a speed proportionately higher as the wheel 15 is smaller thanthe wheel 1.

In the operation of the controller the controller-handle is moved in thedirection from c to 6 until the wheel 14, which in case the wheel 1 werea circular saw would preferably be made of wood, is moved up in contactwith the wheel 1 or until it is seen to be close thereto. Thecontroller-handle is then moved back to the next lug on the controller.In this way the speed of the wheel 1 is never permitted to exceed acertain limit, which depends upon the size of the wheel.

It is well known that in order to obtain best results with revolvingemery-wheels, as well as with revolving cutters of various kindssuch asmilling-cutters, circular saws, and the like a certain peripheral speedshould be maintained and that a higher speed does not only fail toproduce as good results, but may be attended by danger of the wheelbursting from centrifugal force. By means of my improved device alldanger from this source is removed, and the wheel itself is made to acta gage for the speed at which it should be run. In order to provide fordifferent grades of wheels which are adapted to run at differentperipheral speeds, 1 provide the slots 11 and 6 in the lever 9 andcontroller-lever 5, respectively. By means of these slots, as willreadily be understood, the adjustment may be changed to suit the varyingconditions due to the different characters of the wheels used.

Having thus described my invention, what I claim is- 1. In amotor-driventool having a revolving member, the combination with the controller andcontroller-handle, of a movable member adapted to move in the plane ofsaid revoluble member, and connections between said movable member andsaid controller-handle.

2. In a motor-driven tool having a revoluble member, the combinationwith the controller, of a movable roller and connections between saidmovable roller and said controller-handle whereby said movable roller ismade to approach the periphery. of the revoluble member by the movementof the controller-handle in the direction to increase the speed.

3. In a motor-driven tool having a rotatable cutting member, thecombination With a controller and controller-handle, of means connectedwith said controller-handle and adapted to make contact with theperiphery of said rotatable cutting member whereby the movement of saidcontroller-handle is limited by contact of said means with saidrotatable cutting member.

4:. In a motor-driven tool having a revoluble cutting member, thecombination with the controller and controller-handle, of a levermounted on said tool, a roller mounted in the end of said lever andconnections between said lever and said controller-handle.

5. In a motor-driven tool having a revoluble cutting member, thecombination with a support, of a controller mounted on said support, alever mounted on said support adapted to swing in the plane of saidrevoluble member, a link connecting said lever and saidcontroller-handle and means for adjusting the connection between saidlink and said lever.

6. In a motor-driven tool having a revoluble member, the combinationwith a support, of a controller mounted on said support, a lever mountedon said support adapted to move toward said revoluble cutting member, alink connecting said lever and said controller-handle and means foradjusting the connection between said link and said controller-handle.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDI/VIN RUST DOUGLAS.

itnesses:

S. N. THOMAS, J. A. WILKINs.

